Motokichi Kinuta is a supporting character in World Trigger, serving as the Research and Development Director at Border's headquarters. He is a middle-aged, short, and squat man with short black hair and noticeable dark circles around his eyes. As a high-ranking member of Border, he is typically seen wearing a suit. His primary role is overseeing the development department, where he manages the research and creation of new triggers and technology for the organization.

Motokichi is a dedicated and hardworking technician who focuses on the behind-the-scenes work that keeps Border functioning. He is not a combatant, but his contributions are essential to the organization's operations. He is practical and detail-oriented, often dealing with the bureaucratic and logistical challenges of managing a large defense organization. In the away mission selection exam, he takes on the role of a judge, issuing special assignments and evaluating the performance of the participants. This demonstrates his authoritative position within Border's hierarchy and his responsibility in assessing the capabilities of its agents.

Regarding his personal life, Motokichi's motivation includes a desire to protect his family from the dangers associated with Border and the Neighbors. This is reflected in his decision to divorce, keeping his family at a distance to ensure their safety. This decision shows a sense of responsibility and a willingness to make personal sacrifices for the well-being of others. In terms of development, Motokichi remains a consistent figure whose dedication to his work and commitment to Border are evident throughout the series. His key relationships are primarily professional, working closely with other high-ranking officials such as Commander Masamune Kido and Director Masafumi Shinoda. While he is not a main fighter, his role as a developer and judge highlights his importance in the strategic and technological advancement of Border.